WIRING GUIDE
All wiring must be installed in compliance with the National Electrical Code,
applicable local codes, and any special requirements of the Authority Having
Jurisdiction. Proper wire gauges should be used. The installation wires should
be color-coded to limit wiring mistakes and ease system troubleshooting. Im-
proper connections will prevent a system from responding properly in the
event of a fire.
Remove power from the communication line before installing sensors.
1. Wire the sensor base (supplied separately) per the wiring diagram, Figure 2.
2. Set the desired address on the sensor address switches, see Figure 1.
3. Install the sensor into the sensor base. Push the sensor into the base while
turning it clockwise to secure it in place.
4. After all sensors have been installed, apply power to the control panel and
activate the communication line.
5. Test the sensor(s) as described in the TESTING section of this manual.
CAUTION
Dust covers provide limited protection against airborne dust particles during
shipping. Dust covers must be removed before the sensors can sense smoke.
Remove sensors prior to heavy remodeling or construction.
FIGURE 2. WIRING DIAGRAM
2
3
1
2
3
3
1
2
1
(–)
(+)
+
-
UL Listed Compatib
le
Control P
anel
CAUTION: Do not loop wire under
terminal 1 or 2. Break wire run to
supervise connections.
CLASS A OPTIONAL WIRING
Remote
Annunciator
(–)
(+)
RA
+
–
+
RA
+
–
+
RA
+
–
+
C0129-10
TAMPER-RESISTANCE
Photoelectric and temperature sensors include a tamper-resistant capability
that prevents their removal from the base without the use of a tool. Refer to
the base manual for details on making use of this capability.
TESTING
Before testing, notify the proper authorities that the system is undergoing
maintenance, and will temporarily be out of service. Disable the system to
prevent unwanted alarms.
All sensors must be tested after installation and periodically thereafter. Test-
ing methods must satisfy the Authority Having Jurisdiction (AHJ). Sensors
offer maximum performance when tested and maintained in compliance with
NFPA 72.
SPECIFICATIONS
Operating Voltage Range:
15 to 32 VDC
Operating Current @ 24 VDC:
200 uA (one communication every 5 seconds with green LED blink on communication)
Maximum Alarm Current:
2 mA @ 24 VDC (one communication every 5 seconds with red LED solid on)
Maximum Current:
4.5 mA @ 24 VDC (one communication every 5 seconds with amber LED solid on)
Operating Humidity Range:
10% to 93% Relative Humidity, Non-condensing
Operating Temperature Range:
32°F to 115°F (0°C to 47°C)
Air Velocity:
0 to 4000 ft./min. (0 to 1219.2 m/min.)
Height:
2.0˝ (51 mm) installed in B300-6 Base
Diameter:
6.2˝ (156 mm) installed in B300-6 Base; 4.1˝ (104 mm) installed in B501 Base
Weight:
3.4 oz. (95 g)
Isolator Load Rating:
0.0063*
*Please refer to your isolator base/module manual for isolator calculation instructions.
UL 268 listed for Open Air Protection
UL 521 listed for Heat Detectors
This sensor must be installed in compliance with the control panel system
installation manual. The installation must meet the requirements of the Au-
thority Having Jurisdiction (AHJ). Sensors offer maximum performance when
installed in compliance with the National Fire Protection Association (NFPA);
see NFPA 72.
GENERAL DESCRIPTION
Models 2351TB and 2351TB-IV are plug-in type multi-sensor smoke sensors
that combine a photoelectronic sensing chamber and 135°F (57.2°C) fixed
temperature heat detector across addressable-analog communications. The
sensors transmit an analog representation of smoke density over a communi-
cation line to a control panel. Rotary dial switches are provided for setting the
sensor’s address. (See Figure 1.) The intelligent photoelectric and temperature
sensors also transmit an alarm signal due to heat at 135°F (57.2°C) per UL
521.
FIGURE 1. ROTARY ADDRESS SWITCHES
TENS
ONES
9
10
11
12
13
14
15
8
7
6
5
4
3
2
1 0
9
8
7
6
5
4
3
2
1 0
C0162-00
Two LEDs on the sensor are controlled by the panel to indicate sensor status.
An output is provided for connection to an optional remote LED annunciator
(P/N RA100Z).
System Sensor panels offer different features sets across different models. As
a result, certain features of the photoelectric and temperature sensors may be
available on some control panels, but not on others. 2351TB and 2351TB-IV
support Advanced Protocol and CLIP (Classic Loop Interface Protocol) mode.
The possible features available if supported by the control panel are:
1. The sensor’s LEDs can operate in three ways—on, off, and blinking–and
they can be set to red, green, or amber. This is controlled by the panel.
2. The remote output may be synchronized to the LED operation or con-
trolled independent of the LEDs.
3. Devices are point addressable up to 159 addresses.
Please refer to the operation manual for the UL listed control panel for spe-
cific operation. The photoelectric and temperature sensors require compatible
addressable communications to function properly. Connect these sensors to
listed-compatible control panels only.
SPACING
System Sensor recommends spacing sensors in compliance with NFPA 72. In
low air flow applications with smooth ceilings, space sensors 30 feet apart
(9.1 m). When using the photoelectric and temperature sensors as a heat de-
tector in FM3210 compliant applications, space sensors 20 feet apart (6 m). For
specific information regarding sensor spacing, placement, and special appli-
cations, refer to NFPA 72 or the System Smoke Detector Application Guide,
available from System Sensor.
I56-6546-00
2
INSTALLATION AND MAINTENANCE INSTRUCTIONS
2351TB and 2351TB-IV
Intelligent Photoelectric and Temperature Sensors
3825 Ohio Avenue, St. Charles, Illinois 60174
800/736-7672, FAX: 630/377-6495
www.systemsensor.com
1
I56-6546-002
10/10/2020
